visprint- Fractal fingerprint generator.
md5sum (sha1sum) foo.bar | visprint [Options] >
foo.png
Visprint makes cool fractal fingerprint png images based on the
contents of any file. The image will be different for almost every file with
even slightly different contents. Visprint uses the IFS fractal generation
process, pioneered by Michael Barnsley. It is a way to create images which
are self-similar to infinite depths. In other words, the picture is made up
of smaller versions of itself.
Visprint takes a checksum as its input. This is usually a 32-byte
number which is generated from a file. In order to generate the checksum,
you will also need a hash function command such as md5sum or sha1sum.
- -b(0-255)
- Use the given background brightness. 0 means black, 255 means white. You
can try other values, but the resultant image will be quite ugly. The
default is 0 (black).
- -c
- Use the alternate coloring method. Flips RGB to BGR.
- -a
- Create the fractal with 4 different color areas.
- -g
- Create a semi-grayscale image. The output varies heavily depending on the
-b switch.
- -i(1-lots)
- Use the given intensity of color. With a black background, a higher
intensity produces a brighter image. With a white background, higher
intensity produces a darker image. In all cases, calculation time doubles
every time you double the intensity. The default is 30.
- -l(32-128)
- Use the given checksum length. Modify this number to match the hash
function you are using. Examples: 32 for md5, 40 for sha1, 64 for sha256,
128 for sha512... The output of 128 is foggy (but still useful). Higher
values will result in crappy images, therefore 128 is the maximum
accepted. The default value is 32.
- -r(1-1000)
- Use the given value for both the x and y resolutions. The calculation time
will quadruple every time you double this value. The default is 300.
- -t
- Create the image with a transparent background.
- -v
- Output version information and exit.
- -?, -h, --help
- Output help information and exit.
- Current
Maintainer:
-
Goizeder Ruiz de Gopegui
http://www.tastyrabbit.net/visprint
- Previous
Geniuses:
-
Ian Golderg: http://http.cs.berkeley.edu/~iang/
Raph Leviev: http://www.cs.berkeley.edu/~raph/
Hal Finney: http://www.rain.org/~hal/
David Johnston: http://www.cybercities.com/ston/
Soren Andersen: http://intrepid.perlmonk.org/
The original code was written by Ian Goldberg, based on an
idea by Hal Finney, in a post to the coderpunks mailing list. The most
excellent color enhancements were added by Raph Levien. David Johnston
made a port for Win95 console mode and added a bunch of nice features.
Soren Andersen developed the png and transparency code. Goizeder Ruiz de
Gopegui, the current maintainer, cleaned the code, created the
documentation and put everything together.